Fix for [2054894]: LOS not being reset while building a new level.

When I put this fix in a while ago, it caused lots of "floating monsters" when changing levels, but that doesn't seem to happen anymore. Hopefully that was due to a different bug which has been fixed meanwhile.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8927 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on February 6, 2009
2BIO4FOVNITX3SD4LSCGCY7GUSJ7EOC732F3PMHAQBS55DLKTOQQC
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